Extension device



Dec. 1 1929. I P. w. JONES 1,739,464

EXTENSION DEVICE Filed March 2, 1929 A9 I mmvroa.

[39/01'1 4] W./o/zes.

ATTORNEYS.

Patented Dec. 10, 1929 sir-Ares:

Eur QF FliCEi rnn'clvAn-iwi JONES, OF WAB'WIGK; RHODE ISLAND,AssIGNo'E'rd-RosENHEIW Inc; OFPROVIDENCE;'IRHODEISLAND, A co'RPo'R-ATIoNQF RHODE ISLANJJ EXTENSION. "DEVICE? Application": filed March 2,

This: invention relates" to a =foldable ex-- A1-fu-rtherv objectt of;the: invention-- isthe provision of a claspwhich will be readilyresilient 1 fonrunelasping pu-rposes but which will retain?thew-sections; in folded position against -suohstrainsvaswfrequentlyoccur in the strap when in use-.2-

- '25 invention consists 50f: certaintunovel features in ifoldedposition;

Fig. i5 israwsectiona' l view-"of the same;

Figszfi -is: a perspective? View partially in section-i showingr thee-pivoted fingerpiece at the end of one of the strap parts;

Fig.3? isva perspective view ofthe memberhavingggthe"fingerpiece-=thereonb:

IIIJlShB' USGTOf Wrist Watch strapsfit is found desirable-to*provide-afoldab'le-extension'device. *WlllhIIIZlY ibe'i' unfolded-to enlarge theencirclinggsize 'of the Wrist band to permit the Wrist: watchiconnectedthereto, to beremovedwfrom the hand ofvthe' wearenwithout 1929Serial-'No. 344;0102- disconnecting any ofthe parts and it -is" furtherdesired-to hold tliese foldableip arts together by a resilient-clasp-which twill have suflicient inherent spring of thestock-topmventunclasping of the parts by vthe usualstrainstowhich adevice-bf thisscharactei is-subjected; It is -also-desired to "provide afinger-engagin g part which may;v be readilymanually engagedsto easily-unclasp;;the"=sec tionsto permit them-to be *swun g onetheir pivots tounfolded position; and in-order to accomplish this desired result I haveformeda clasp byproviding; spaced slits-in the, side. Walls of thechannelsection to i-form --finger+. pieces-i between the S1-itS'rt0*engage-protuberances on, the side edges of a plate'section-anderesiliently hold the sections in-folded-qposi tion and -I have alsopivoted .-to-:the end5of one ofthesections a member havinggafinger pieceextending ttherefrom which may vbe readily engaged to 1 causeanunelaspin-g ;of the sections-permitting them to swing ,oneon theother; and the following is- 'ardetailed. description ofthepresentcmbodiment'otthis invention and illustrating the preferred meansbyq-which these-advantageousmesults may be accomplishedi IWith-*referenceto the drawings; desig; nates channels sectionthavingside 1 Walls 11- and 12 andabottomwalk-13. Th6-SldG Walls "of thissection:- are- -sli-tat 5a point in- Ward-from its end as at14-ande15-to pro vide' between the slits aresilient finger -16'and inorderthat the resiliency -of this finger may be enh-anced th'e slits 14Z and,' -=extend into the bottonrwall- 13 aswilh be apparent from Fig.1.

Aaplate section 17 is hinged as atu'18to the channel section 'and may befolded into the channel section: byswinging-about the hinge 18'and heldin foldedpo'sitionby the arc-shaped protuberances orportions 19'extendinglaterally from theopposite edges of thesection 17 intermediateitsfendsand engaging With and betweenthefingers 16 i edgesQO are thenirever'selycurved-outward- I ly, as illustrated in Fig. 3, in order toform a flaring entrance for'the protuberances on the edges of the platesection 17.

A strap part 21 consisting of a plurality of block links is connected tothe channel sec tions 10 bymeans of a pivot pin 22 engaging the sidewalls 11 and 12 thereof, while the strap part 23 is connected betweenears 24 bent up from the side of the plate section 17 by a pivot pin 25engaging the member 26 which has a fingerpiece 27 extending from oneedge thereof to overlie the strap part 21 and provide a portion forengagement by the fingernail to lift the section 17 from claspedposition to permit it to be swung about its hinge 18 to unfoldedposition.

The member 26 is shaped to conform to the appearance of the links of thestrap part 23 and serves as a terminal or end thereof with wire'portions29 for connecting it to the remainder of the strap part 23 and themember is provided with a pair of eyes 30 extending from its uppersurface thru which the pivot pin 25 extends to hold it in position.

The section 17 is notched as at 28 in order to prevent the fingerpiece27 from engaging with the section 17 when the device is in extendedposition, as illustrated in Fig. 1, and thus prevent the exertion ofleverage by a pull on the strap 13, between the connections of themember 26 and the section 17 which might injure the parts. v

The foregoing description is directed solely towards the constructionillustrated, but I desire it to be understood that I reserve theprivilege of restoring to all the mechanical changes to which the deviceis susceptible, the invention being defined and limited only by theterms of the appended claims.

I claim:

1. An extension device for a wrist strap comprising a plurality ofsections hinegd togetherto fold one over the other, portions extendinglaterally from the opposite edges of one of said sections intermediateits ends, and arch-shaped resilient fingers on another of said sectionsbetween which said portions may snap to hold said section in foldedposition, said fingers being arc-shaped in the longitudinal direction ofsaid sections.

- 2. An extension device for a wrist strap comprising a plurality ofsections hinged together to fold one over the other, arc-shaped portionsextending laterally from the opposite edges of one of said sectionsintermediate its ends, and resilient fingers on-another of said sectionsbetween which said portions may snap, said fingers being arc-shaped inthe longitudinal direction of said sections'to engage the said portionsalong an extended surface and hold said section in folded position.

3. An extension device for a wrist watch strap comprising a pair ofsections hinged to gether to fold one on the other, one of said sectionsbeing in plate form with protuberan e on itsopposite sides andpositioned adjacent but spaced from its free end, the other sectionbeing channel shape in cross section with each of said channel wallshaving a pair of spaced slits forming between the slits a resilientfinger, said fingers being positioned to extend over said protuberanceswhen snapped therebetween.

4. An extension device for a wrist watch strap, comprising-a pair ofsections hinged together to fold one on the other, one of said sectionsbeing in plate form with arc-shaped bulging portions extending from itsopposite sides and positioned adjacent but spaced from its free end, theother section being channel shaped in cross sections with each of saidchannel walls having a pair of spaced slits extending a short distanceinto the bottom of said channel section forming between the slits aresilientfinger, said fingers being curved on substantially the arc ofsaid bulging portions to engage the same throughout thecurved surface Iand bent inwardly and outwardly at their edgesto receive and extend oversaid bulging portions when snapped therebetween.

5. An extension device for a wrist watch strap, comprising a pair ofsections hinged together to fold one over the other, means for'releasably retaining said sections in folded position, ears on one ofsaidsections, a member. pivoted in said ears, a fingerpiece extendingfrom said member for manual engagement to unfold said sections, and anotch in the end of said sections to prevent engagement of saidfingerpiece and section when in unfolded position. r

6. An extension device for a wrist watch strap comprising a pair ofsections hinged together to fold one on the other, one of said sectionsbeing in plate form, the other section being channel shape in crosssection with each of said channel walls having a pair of spaced slitsforming betweenthe slits a resilient finger, said fingers beingpositioned to extend over the edges of said plate section when snappedtherebetween.

7. An extension device for a wrist watch strap comprising. a pair ofsections'hinged together to fold one on the other, one of said sectionsbeing in plate form, the other seeeach .of said channel walls having apair of spaced substantially parallel slits forming between the slits aresilient finger, said fingers being'inclined inwardly-to extend overthe edges of said plate section when snapped therebetween.

. 8. An extension device for a wrist watch strap, comprising a bottomsection and a top section hinged together with the top section overlyingthe bottom section, means for releasably retaining said sections infolded potion being channel shape in cross section with sition, and amember having a fingerex tene I sion for manual engagement pivoted tothe outer surface of the free end of said top section for lifting orpulling the free end of the top section away from the bottom section.

9. An extension device for a Wrist Watch strap comprising a bottomsection and a top section hinged together with the top section overlyingthe bottom section, means for releasably retaining said sections infolded position ears on the top section adjacent its free end andextending outwardly therefrom, a member pivoted in said ears and afinger-' piece extending from said member for manual engagement to liftor pull the free end of the top section away from the bottom section.

In testimony whereof I afiix my signature.

PERGIVAL W. JONES.

